I will gladly simplify it.
9k - 6k + 7k - 8
9k - 6k = 3 k
3k + 7k - 8
3k + 7k= 10k
10k - 8 = 2k
So the simplified form of 9k - 6k + 7k - 8 is 2k
~*"AUBA14"*~
Answer:

Step-by-step explanation:
To find out the m(slope) of the equation use the formula:
.
Substitute the values:

Combine the values:

Find the value of the fraction:

M is -3.
The equation so far is 
To find the y intercept, substitute one pair of coordinates into the equation and solve for b:
.
We see that b =-17 so the full equation would be:
.
4/7 of the children in the pool are girls
3/7 of the children in the pool are boys
4/7:3/7
4:3 is the ratio of girls to boys
Answer: $178.13
Step-by-step explanation:
418x0.16=66.88
22.25x5=111.25
111.25+66.88=178.13